PDF malware analysis — malicious · deb5bd9875ca54e3

MALICIOUS

PDF

127.8 KB

MD5: 15022c6828b0163ebad7365f9c62bc73 SHA-1: 2cc655264fccaeb8bf508bee405bba322ee9f983 SHA-256: deb5bd9875ca54e32726c019ef74bd2ee12e8c3e7dc666edaa39165ff1e6dcdb

192 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains heavily obfuscated JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_UNESCAPE. The ML classifier and ClamAV also flagged this file as malicious. The embedded JavaScript streams are likely responsible for downloading and executing a second-stage payload, though the exact mechanism is obscured by heavy obfuscation. No specific IOCs like URLs or hashes were directly extractable from the provided evidence.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 8

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0116_000.js` `86b1b72b543ca9a064f7e90339b62b72703591b75755c160b62bc36e2dc20928`	pdf-javascript-stream	PDF /JS object 116 at offset 0x4BB	40737 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 214 eval/decoder/string-building token(s).
`javascript_obj0116_002.js` `71e149c8036ca1d690fa4ce31f386c93b8509e03cf1debd11da7c89b2e529ca1`	pdf-javascript-stream	PDF /JS object 116 at offset 0x53A	40745 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 214 eval/decoder/string-building token(s).
`javascript_obj0123_003.js` `6d4813b55de494e5a8fead4233e60f5ef48ff8a46a95bc9f06af198ffdfb67e6`	pdf-javascript-stream	PDF /JS object 123 at offset 0x386	129975 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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